A Planar Cross Section Through Two Spherical Waves Emanating from the Sources

question 47

Multiple Choice

A planar cross section through two spherical waves emanating from the sources S₁ and S₂ in the plane is shown in the figure. The black circles are one and two wavelengths from their respective sources. The lighter circles are one-half and one-and-a-half wavelengths distant from their respective sources. If the phase at S₁ and S₂ is zero at this instant, and the waves shown arriving at P₂ both arrive with amplitude A, the difference in phase angle at point P₂ (in radians) is ​ ​

• A)0.
• B)π/2.
• C)π.
• D)3π/2.
• E)2π.

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